Hole burring tool



Aug. 18, 1953 Patented Aug. 18, 19053 i UNITED STATES PATENT OFFICE This invention relates to certain new and useful improvements in a hole burring tool and has for its principal object a tool that can be used for burring holes of various diameters.

Another equally important object of this invention is to provide a tool of this character that is highly eicient in use and economical in manufacture.

Among the several objects of the invention is to provide a burring tool that is capable for usein holes of various diameters, whereby the burring blades are adapted to siidably engage the top edge of the hole that is to be burred. f

Other objects will appear hereinafter.

The invention consists in the novel combination and arrangement of parts to be hereinafter described and claimed.

The invention will best be understood by reference to the accompanying drawings showing the application of my invention, and in which:

Fig. l is a perspective view of the burring tool embodying my invention;

Fig. 2 is a sectional detail view taken substantially on lines 2-2 of Fig. 1;

Fig. 3 is a sectional detail view taken substantially on line 3-3 of Fig.l 2;

Fig. 4 is a side sectional detail view taken substantially on line 4 4 of Fig. 2; and

Fig. 5 is a side elevational view similar to Fig. 2 but showing the parts in diierent position.

To accomplish the objects of my invention I provide a conical shaped body I comprising two parts II and I2 held together by any suitable means, such as screws I3 and I 4. These parts II and I2 provide confronting grooves II and I2 respectively, which, when the tWo parts and I2 are connected together, provide a bore I5, wherein a shaft I6 is contained. Each body part II and I2 has on its confronting at surfaces, hollowed out portions I of slightly less depth than the grooves II and I2', forming the bore I5. These hollowed out portions |5 are so located that when the body parts II and I2 are fitted together the hollowed out portions I5 will be located on either side of the bore I5.

The body parts I I and I2 have formed in their peripheral edges I9 and 20, channels 2| and 22, which are cut so as to leave a protruding lip 23 extending into the channels 2| and '22. These channels 2| and 22 are so constructed that when the body parts II and I2 are joined to form the conical body lil, the channels 2| and 22 will be on opposite sides of such body I0.

Each body part II and I2 has formed therein, on its edges opposite the channels 2| and 22, a

cut-out portion 24, the purpose of which will be hereinafter described.

The shaft I3 has an elongated slot 25 formed therein in which is journaled the screw I3. 'I'he shaft I6, on its sides opposite the elongated slot 25, terminates in a bifurcation 20. The open sides of the bifureated end portion 26 correspond to the sides of the conical body IG that have the channels 2| and 22 formed therein. In this bifurcation 26, on pintles 21,ride the legs 3| of the burring blades I'I and I8. When the shaft I6 is inserted to the full length of the bore I5 the shaft end 23 rests in a curved seat 29. This curved seat 29 together with the screw I3 which is journaled in the slot 25 serves to limit the movement of the shaft I6 in the body I0.

The burring blades II and I8 each consist of cutting heads 30, with legs 3| extending therefrom. At the inner portion of each cutting head 3o there is an enlarged base 32, which base 32 will ride in the channels 2| and 22. The lip 23 of each channel will override the enlarged base 32, thereby securing the cutting heads 30 in a slidable relation with respect to the peripheral edges I9 of the conical body I0. The cutting heads 30 each have a cutting edge 33 on their lower side.

The legs 3| of the burring blades I1 and I8 extend into the hollowed out portions I5 of the body parts II and I2, and pass through the bifurcated end 26 of the shaft I6 and ride alongside each other on the pintles 2'I. The extremities of the legs 3|, when the shaft I6 is extended into the body I0 so as to cause the shaft end 28 to rest in the curved seat 29, will protrude from the body I0 through the cut-out portions 24. The legs 3| are of such length that the ends will never ride 01T the pintles 21.

It can readily be seen that movement of the shaft I6 into or out of the body I0 will cause the blades I'I and I8 to move in either an upwardly and outwardly, or a downwardly and inwardly direction. This by reason that the blades II and I8 ride in the channels 2| and 22 and are held on the peripheral edge I9 of the body I 0 by the protruding lip 23 of the body parts II and I2 and the enlarged base 32 of the blades I'I and I8, which rides in the channels and behind the lip 23. Therefore when the shaft I6 is raised, the legs 3| of the blades I1 and I8 which rest on the pintles 2'I will be drawn upwardly, the cutting heads 30 Will be caused to ride in the channels 2| and 22, and their movement will be upwardly and outwardly, pulling the legs 3| outwardly across the pintles 2l. But

o in all positions of the blades I1 and I8 in the channels 2| and 22, the cutting edges 33 Will present the same surfaces to any Work engaged.

The mode of operation of the afore-described burring tool is as follows:

The cone-shaped body l0 is inserted into a pre-stamped hole of any diameter, in any type of metal work piece. The body I0 is inserted until the diameter of the hole is filled by the body. The shaft? I6. isthen lowered and the blades riding in the channels 2| and 22 are brought into contact with the metal work piece so that the cutting edges 33 now engage the edge of the hole. By rotating the shaftiLtheand modification Without departing from the spirit o f the invention. I', therefore,A do not wish to be limited to the precise details ofconstruction Set forth, but des-ireto avail myself of such variations and modifications as come within the scope of the appended claims.-

Having thus described my invention, what I claimasinew and desire to protect` by Letters Patentis:

l. A, tool comprisingV a conical shaped' body having acenter bore in said body, a shaft slidablyjournaled in said bore, said shaft having its inserted end bifurated, burring` blades, means to slidably secure said blades to said bifurcated end of said shaft; for lateral. movement with respect thereto when said shaft is slidably moved in said;v

bore, means forfslidably containing said blades on the peripheral edge of said body, said; last named; means inc1uding channels formed in the peripheral edge, ofisaid` body, said channels provided vwith a, protruding lip extending. into said channels andlmeans for slidably containing said. blades in said channels. to the rear of said lip, and means for limiting the movement of said shaft in said bore.

2; Aburring tool comprisingl a conical shaped body formed in two parts each having hallowed:

out portions, means for securing said body parts together, said body having a center bore provided by said hollowed out portions, channels formed in opposite peripheral edges of said body parts so when the parts are secured together said channels and said hollowed out portions are on opposite sides of said bore, a shaft slidably inserted in said bore, said shaft having its inserted end bifurcated, burringwblades,4 means for slidably. securing said; bladesginrsaid bifurcated end of said shaft', means for slidably containing said blades in said channels on the peripheral edge of'said body when said shaft is slidably moved ingsaidgbere, and means for limiting movement of saidshaft in said bore.

3:- burring tool comprising a conical body formed in tivO-parts each having hallowed out portions, means Ifor securing said parts together tosprov-idda center bore in said body, channels formed in opposite peripheral edges of said body parts sogwhen the-parts.; are securedptogether said channels andsaidholmwed outportions are.

onoppositeg sidesof-said bore,v ashaft slidably inserted in. saidbore,I said shaft having, its inserted'end bifurcated;burringblades, said .blades havingV cutting heads with an enlarged base portion and-adeg extending therefrom, means for. slidably securing said leg in said bifurcatedfend,

offsaidfshaft, means for slidably containing said enlargebase portiony in said channelsand said cut-ting; heads. on said peripheral edge of said body for ,lateral lrnovement thereonl when said shaft is slidablymoved in said bore, and means for limitingtbe,(movement,A of said shaft in said bore;

FRANK FENNELL.

References-.Citedin the -.rile of this-patent UNITED vSTl'FES PATENTS Number Name Date 321,116` Kelly et al l June 30, 1885 686,273 Dunn Nov. l2', 1901 1,123,145 Shaw Dec. 29, 1914 1,346,105 Bosse July 13, 1920 1,409,379' Hunziker Mar. 14, 1922` 

